- Joined
- Dec 15, 2011
- Messages
- 905
- Mac
- Classic Mac
- Mobile Phone
Don't forget it!
I don't know why I didn't do this yesterday when the screen was all taken apart, but I should've tested resistance to ground for confirmation of whether the orange inverter wire is a GND or not. Oh well, will do it later today.
Good question. Are you sure, that the orange wire always has 0V? I you compare with my 17" wiring table below, you cash see that there is no On / Off (VEDID) wire. I assume, that the only On / Off signal for the backlight comes from the dimmer wire (Voltage below ca. 0.6V = backlight off)
MacTester
Understand you are well down your own path, but one of my justifications for reusing the original PSU was it specs. In your own case the G4 PSU is capable of producing around 190w if you only run it at 40w-70w (guess), the PSU is under no real stress so much reduced chance of failure. And if it does fail, you just have the replace the affected capacitors.I thought long and hard about the original PSU. The vendor who sold me this machine told me that about 5 years ago it made a "POP" sound one day and he took it to the Apple Store for a PSU replacement. So the one currently installed is probably not as old as most in this vintage of machine. I figured that the odds of that happening again are probably higher with a G4 PSU than with a new 90W Antec brick. If I ever had to rework this project from a G4 PSU into a new model PSU it'd be a major re-think, so why not just use new hardware at the start? 90W should be plenty for what I'm going to do here anyway.
Have you seen jBergs posting on the inverter pinout.
http://www.dremeljunkie.com/2011/07/20-imac-g4-inverter-pinout-not-tested.html